106 lines
2.3 KiB
C
106 lines
2.3 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Generic SH-4 / SH-4A PCIC operations (SH7751, SH7780).
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*
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* Copyright (C) 2002 - 2009 Paul Mundt
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*/
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#include <linux/pci.h>
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#include <linux/io.h>
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#include <linux/spinlock.h>
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#include <asm/addrspace.h>
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#include "pci-sh4.h"
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/*
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* Direct access to PCI hardware...
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*/
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#define CONFIG_CMD(bus, devfn, where) \
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(0x80000000 | (bus->number << 16) | (devfn << 8) | (where & ~3))
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/*
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* Functions for accessing PCI configuration space with type 1 accesses
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*/
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static int sh4_pci_read(struct pci_bus *bus, unsigned int devfn,
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int where, int size, u32 *val)
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{
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struct pci_channel *chan = bus->sysdata;
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unsigned long flags;
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u32 data;
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/*
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* PCIPDR may only be accessed as 32 bit words,
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* so we must do byte alignment by hand
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*/
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raw_spin_lock_irqsave(&pci_config_lock, flags);
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pci_write_reg(chan, CONFIG_CMD(bus, devfn, where), SH4_PCIPAR);
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data = pci_read_reg(chan, SH4_PCIPDR);
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raw_spin_unlock_irqrestore(&pci_config_lock, flags);
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switch (size) {
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case 1:
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*val = (data >> ((where & 3) << 3)) & 0xff;
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break;
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case 2:
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*val = (data >> ((where & 2) << 3)) & 0xffff;
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break;
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case 4:
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*val = data;
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break;
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default:
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return PCIBIOS_FUNC_NOT_SUPPORTED;
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}
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return PCIBIOS_SUCCESSFUL;
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}
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/*
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* Since SH4 only does 32bit access we'll have to do a read,
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* mask,write operation.
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* We'll allow an odd byte offset, though it should be illegal.
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*/
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static int sh4_pci_write(struct pci_bus *bus, unsigned int devfn,
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int where, int size, u32 val)
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{
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struct pci_channel *chan = bus->sysdata;
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unsigned long flags;
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int shift;
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u32 data;
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raw_spin_lock_irqsave(&pci_config_lock, flags);
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pci_write_reg(chan, CONFIG_CMD(bus, devfn, where), SH4_PCIPAR);
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data = pci_read_reg(chan, SH4_PCIPDR);
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raw_spin_unlock_irqrestore(&pci_config_lock, flags);
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switch (size) {
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case 1:
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shift = (where & 3) << 3;
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data &= ~(0xff << shift);
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data |= ((val & 0xff) << shift);
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break;
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case 2:
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shift = (where & 2) << 3;
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data &= ~(0xffff << shift);
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data |= ((val & 0xffff) << shift);
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break;
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case 4:
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data = val;
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break;
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default:
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return PCIBIOS_FUNC_NOT_SUPPORTED;
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}
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pci_write_reg(chan, data, SH4_PCIPDR);
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return PCIBIOS_SUCCESSFUL;
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}
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struct pci_ops sh4_pci_ops = {
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.read = sh4_pci_read,
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.write = sh4_pci_write,
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};
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int __attribute__((weak)) pci_fixup_pcic(struct pci_channel *chan)
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{
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/* Nothing to do. */
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return 0;
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}
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